This year, take a train ride across America as the U.S. Botanic Garden’s annual holiday show Season’s Greenings showcases train stations! Plant-based recreations of iconic train stations from across the United States will be represented in the train room. Explore classic stations like New York City’s Grand Central Terminal, St. Louis’ Union Station, and many more. Thousands of blooms will be on display throughout the Conservatory, including a showcase of heirloom and newly developed poinsettia varieties. Their collection of DC landmarks made from plant materials will return to fill the Garden Court, this year including a botanical version of several landmarks. Various hours of operation. Free to attend. U.S. Botanic Garden Conservatory: 100 Maryland Ave. SW, DC; www.usbg.gov